Can I link log files to my web directory var/www ?
so I have var/www/logs
And then remove reading permission to others in my unix link preferences ?
By the way can I change links preferences ?
Yes you can link to them. If you do that you'll be opening up the logs to others if you leave it 755 for /var/www/log. Since you seem not to want that you could put some form of authentication as a requirement before they can see/use the link. Means you'll have to distribute a shared password to those whom you DO wish to be able to see it.
Yes you could link
But if you do that everyone who guesses the link to your logfiles can see them so some sort of protection is really needed.